Ok, I was assuming you would also view the created pdfs in linux, and that the viewer would be FOSS and thus easy to have such restrictions removed. Still, screengrabs, etc.
If there's some standard or secret way of making such a protected pdf you'll have to find the spec if it's published. But you might run across some stupid laws (DMCA?) about reverse engineering any protection scheme if you're in the US-up to you to know about that it more detail.